Matrox DRI disabled in 6.8.99 (experimental)

[Jean-Christophe Dubacq <jcdubacq1@free.fr>]

I have a MGA G550 and find that the DRI is disabled in the latest  
update to experimental.
According to Xorg.0.log, everything goes fine until the drm fails to  
map DMA buffers.
Any idea?
uname -r is 2.6.14-2-686 (stock debian linux kernel)
xorg.0.log attached
xorg.conf probably not interesting (attached anyway)

Attachment: Xorg.0.log
Description: Binary data

Attachment: xorg.conf
Description: Binary data

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JCD